The development of functional polymer parts with complex geometrical shape has been possible through additive manufacturing. In this research work, the issues such as warping, filament clogging, and layer delamination related to fused deposition modeling‐based 3D printing of nylon 6 are focused and its poor printability is improved. Nylon 6 is toughened by blending with an impact modifier, ethylene terpolymer. Complex viscosity, storage, and loss moduli of modified nylon increase significantly, which help to improve 3D printability of nylon 6. 3D printing of modified nylon is performed at optimized conditions, such as printing temperature, print speed, bed temperature, and cooling speed. Izod impact strength of 3D printed nylon 6‐based blend is observed ≈543 J m⁻¹, which is significantly higher than the value (48 J m⁻¹) available in literature for injection molded pristine nylon 6. Thermomechanical analysis of modified nylon shows higher coefficient of linear thermal expansion in normal direction as compared to that in flow direction, which is due to the orientation of polymer crystals during processing. The voids are observed on the cross‐sectional surface of impact fractured sample, which are responsible to produce light‐weight 3D printed specimens.

中文翻译：

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新型抗冲改性尼龙6的3D可印刷性研究：实验研究和性能评估

通过增材制造，可以开发具有复杂几何形状的功能性聚合物零件。在这项研究工作中，着重解决了与基于熔融沉积建模的尼龙6 3D打印相关的翘曲，长丝堵塞和分层等问题，并改善了其不良的可印刷性。尼龙6通过与抗冲改性剂乙烯三元共聚物共混来增韧。改性尼龙的复数粘度，储存性和损耗模量显着增加，这有助于改善尼龙6的3D可印刷性。在优化条件下（例如印刷温度，印刷速度，床温和冷却速度）进行改性尼龙的3D打印。观察到3D打印尼龙6基共混物的悬臂梁冲击强度≈543J m ^-1，远高于文献中有关注射成型的原始尼龙6的值（48 J m ^-1）。改性尼龙的热机械分析显示，与流动方向相比，法线方向的线性热膨胀系数更高。由于加工过程中聚合物晶体的取向。在冲击破裂样品的横截面上观察到空隙，这些空隙可用来生产轻质3D打印样品。